5-halogen-2-amino-1-alkyloxy and 1-aralkyloxy-benzenes and intermediate products thereof and process of preparing them



Patented Feb. 10; 1931 WILHELM rrrzxm. on FRANKF onT-o1\T-THE;1vrnrngrroe1rsr;a GE ANY, 'nssrgfnon mo GENERALANIPINVE2WQR3$aINC-@511 EWgsYQBK; N; QR QBrATIQNQEDE rA:

o ARE:

s-nenoenn-a-n yrrno,i amrgnozgi-Ann l-nnnnnYLoxr-nn'nznnns am IN'rERQ a EDIA F- J U II eesaw 53 3 33OFE N-G T M I I Ilfo Drawing, Application fi led J'anuary 5, 192 9, (S: eria.1 No. 330,625, and in G erma ny January IY, 1928.

, 'l.\{ 'resent inention relates to b-halogen 2'- amino-1'-alkyloxy-and-l-aralkyloxy ben-' v zenes and intermediate products thereof and toa process of preparing them.

" When halogenating Q-acyl-amino-l-alkyb oXy-and-l-aralkylo;ry-benzenes according to the halogenating methods usually applied to acylatedorganic amines, there are obtained 7- as mono-halogen products chiefly l -halogen- 2'-acylamino l alkyloxyI- and 1 aralkyloxybenzenes. f V "Now 'I-h'avecfound that by causing a quantity off-halogen, adequate for the introducwherein R stands for alkyl or aralkyl. v The halogenating operations can be car tion'. of 2 halogen atoms, to act upon adisubstituted symmetrical diphenyl-urea of the following general formula wherein stands for all yl orf arallryl,

Th s mp n s," when. bein split up by eans ef a 'ti lkeli or mm n um V ClIXlCle,. are conyerted into -halogen-2- mi orlkylbxyndd mlk l y e Zle e which hitherto, could only be producedwith ere but partlyknown, and

a e hee w n general rmula 7 Hal ried out according to the most Varied methvrods without the result lbeing considerably altered thereby. V

,oxy benzenes,

oxy-diphenyl-ureas used as starting mate rials are obtainableby causing the corresponding amino compounds to react with phosgene in the, presence -Of'-21Ilfl&3lClfbiHdiILg agent. I

- r. 5; 7' In the same way as the. diphe nylsureasires 'ferred to, thepcorresponding. diphenylthio-v ureas are suitable for theamanuiacture oI r5:-;

The followingyexamplesflseryeeto illustrate my invention but they. are not. intendedfto' limit it thereto, the/parts being by weight,

, l.,l36 parts of o,o. xdimethoxydiphenyh j I 65 rachlorethane. To'thissuspension'are added urea aresu'spended in. about :1000rparts .oftet-i halogen-QTaminOel -alkylOXy and LaraIkyl- Y drop by drop, whilestiri'ing, 145 parts of sul-z V furylechloride at a temperature. between C. and C: Whenthe chlorinationis com..- plete the solventis distilled .ofi'; 1 The dichloro compound :thus .obtained' an'd hav'ing the; fol-:7 1

lowing probable formula:

orao V 7 com I v V V e r u "T 7 01 -Q ol is heated together with 100 ofammm nia of 25 per cent strength and 500 parts of Water in a closed vessel';f0r--four ,hou'rs up; to

150 (1- After cooling, the base is filtered by suction and dissolved indiluted hydrochloric acid." The hydrochloride is salted out and worked up as-usuallso a's -to obtain the' free base. Thevcompound-thjus obtained isthe lqn .-2 m e-.1 1 -meth0xyben ene whic if rsdi t l qe n v um zll ldirecrystalli- Y 1 r zttion" ml a theryme' ete cut 2.1mm a, suspensionlof partsof: o,o'

dimethoxy diphenyl urea and, r 0ioparts olf,

nitrobenzeneare, introduced? 5 parts'o-fchlm mixture is heated-in a closed Vessel for 4: hours;

loo

oxy benzene of the melting point of 52 C, is obtained thereby. y

1 3. 140 parts of 0,0-dimethoXy-diphenylurea aresuspendedin about 1000 parts of tetrachlorethane. To this suspension are then addeddrop by drop, while stirring, 960 parts of bromine at a temperature of between 10 C.

and 30C. "When the bromination is complet'e thesolvent'is distilledoff. The residue which chiefly consists of a 'dibrominecompound of the following probableformula V e I ooH3- 7 com .E e I.

isheated-togetherwith 700 parts of ammonia in a closed vessel for 10 hours up to 150 C.

After cooling, the mass is filtered'ofi bysuction anddissolved in diluted hydrochloric acid. The hydrochloride is salted out and worked up as usual so as to obtain the free base. zene thus obtainedyafter distillation in a vacuum and recrystallization from petroleumether, melts at 60 (l-61 Ca Q; 150 parts" of 0,0-diethoxy-diphenyl urea are suspended-in 1000 parts of tetrachlorethane; To this suspension are added dropby drop, while stirring, 145 parts of sulfurylchloride at'a temperature of between 10 C. and'20 G. When'the chlorination is complete the solvent is distilledioif. Thechlori nation product thus obtained has theprobable formula: I

OQaHs On-laddition of 200 parts of ammonia of 25 per cent strength and 500 parts of water the product is treated in a closedvessel for 5 hours to 150 C. After cooling, the base.

which forms an oil is' separated from the reaction mass and dissolved in diluted hydrochloric acid; The hydrochloride'is salted out and worked up asusualv so as to obtain lthe free base. i The compoundis the 5 chloro-2e amino-l-ethoxybenzene which, after distilla tion in a'vacuum and recrystallization from petrol ether, melts at 32C;

. 5. 178 parts of o,of clibutyloxy diphenyl' I ureaare suspended in 1500 parts of tetrach lorethane. .To this suspension are. added dropby drop, while stirring, 14 5; parts of sulfuryl-chloride at a temperature of be tween 10 C. and30'G. When the chlorination is complete the solvent is distilled 3 oft. V

The :7 residue [which 'chiefly;-j consists gof the The 5-bromo-2-amino-1-methoxybene hydrochloric acid; The hydrochloride is (salted out and workedup as usual so as to obtain the free base. The 5-chloro-2-aminol-butylo'xybenzene is a colorlessviscous oil, which boils at 160 C. under a pressure of 2 mm- The dibutyloxy-diphenyl-urea is obtainablefrom phosgenefand o-amino-phenyl butylether; the latter can be produced from o-chlornitro-benzene and butyl alcohol in the presence of an acid binding agent and by subs sequent reduction.

6. 212 parts of 0,0-dibenzyloxy-diphenylurea are dissolved in 4000 parts of chlorobenzene. 145 parts of sulfury-chloride are then added drop by drop, while stirring, at a temperature of between. 20 Gfand 30 C.

When the chlorination is; complete, the solvent is expelled by means of water-vapor... The residue which chiefly consists of the dichloro compound of the following probable of 25 per cent stren th in a closed vessel for 7 hours to 150 C. fter cooling, the base is filtered off by suction and dissolved in diluted I hydrochloric. acid. The hydrochloride is,

salted outand worked up as usual so as to obtainvthe free base. The 5 -chloro-2-aminol-benzoyl0 iy:benzene melts at 4647 C;

Thejdibenzyloxy diphenyl-urea can be produced from phosgene and 0-amiriophenylbenzyl ether, the latter being obtainable from o-nitrophenol and benzylchloride in "the presence of an acid bindingage'nt and subsequent reductiom f T In the following claims the term strong alkali is to be understood as comprising CZHIIStlIC 'alkalies and ammonium hydroxide; c aim:

Hal

wherein a was an} alkyl 01 arall'zyl, which is heated togetherwith 700 com. of-ammonia I 1.'Tlie process of obtaining amines of the following general formula:

; comprises treating a cli-substituted symmetrical -cli-phenylurea of the following general formula wherein R stands for alkyl or aralkyl, with a quantity of a ahalogenating agent adequate for the introduction of 2 halogen atoms, and heating the cli-halogen compound thus ob tainecl and having the following formula:

' wherein Ristanclsfor alkyl or aralkyljiii an cal cliphenyl-urea of the following general formula:

7 OR on wherein R stands for alkyl or aralkyl,- with l a quantityof a chlorinating agent adequate for the, introduction of 2 chlorine atoms and heating the'dichlorojcompouncl thus obtained and having the following general formula: 1

wherein R'stands for alkyloraralkyl, in an gaqueoussolution of a strong alkali. v

,3. The process of obtaining amines of the following general formula: V

' I V Onlkyl which comprises treatingaa cli-suhstitutecl symmetrical cliphenyl-urea of the following general formula: 7

with a quantity of a halogenating agent ades formula qnate for the introductionof Qhalogen atoms and heating thev dihalogencompound thus obtained and having the following general formula: V c

- 0.a]ky1 .x O aIkyL in an laqueous solution-of a strong alkali- 4. The process of obtainingamines of the 7 following general formula. r l I .O'.alk yl which comprises treating a (ii-substituted symmetrical diphenyl-urea of the following general formula: v

' with a quantity of achlorinating agent acle qu'ate for the introduction of 2' chlorine atoms formula in an aqueous solution astrongalkali. V

5.;The process of obtaining ofthe following general formula 0 cm which comprises treating the symmetrical and heating the dict-1 1 0 compouncl'thusob stained an cl' having; the following general 7 dimethoxy-rliphenyl-urea Q j following formula: H V v Q OOHs joons V with a quantity of a halogenating agent adequate for the introductionof 2 halogenatoms and heating the dihalogen compound thus obtainecl and having the following general -i an, aqueous solution; of-agtrong: lkali- .c r F 6. The process of obtaining-5 chloro-2- amino-l-methoxy benzene, which comprises treating the symmetrical dimethoXy-diphenyl-urea of the following formula:

' OCH OCH:

with a quantity of a chlorinating agent adequate for the introduction of 2 chlorine atoms and heating the dlClllOIO-CllIIlBtllOXY-(llphenyl-urea of the'following formula:

' OCH: 7

OCH:

in an aqueous solution of a strong alkali.

7. As new products, dihalogen compounds of the following general formula:

i 04% V i HMO g wherein It stands forvalkyl or aralkyl, which,

when being heated in an aqueous solution of a strong alkali, are split up with formation of an alkali salt of carbonicacidinto2 mols of an amine of the following general formula wherein stands for alkyl or aralkyl.

8. As new products, dichloro compounds of the following general formula:

OR OR wherein R stands for alkyl or aralkyl. v

' 9. As new products, dihalogen compounds of the following formula:

Hal

which, whenbeinig heated inan aqueous so1ution of a strong alkali, are split up,

formation of an alkali salt of carbonic acid, into 2 mols of an amine of the following general formula:

10. As new products, dichloro compounds of the following formula:

which, when being heated in an aqueous solution of astrong alkali, are split up, with formation of an alkali salt of carbonic acid, into 2 mols of an amine of the following 7 general formula 0 .alkyl 11. As new products, dihalogen compounds of the following general formula: OCH:

iHal

which, when being heated in an aqueous solution of a strong alkali, are split up, with formation of'an alkali salt of carbonic acid, into 2 mols of an amine of the following general formula V 1 2. As a new product, the dichloro-dimethoXy-diphenyl-urea of the following formula: g

OCHa t OOH;

7 which,'when being'heated in an aqueous solution of a strongalkali, is split up, with formation of an alkali salt of carbonic acid, into 2 mols of '5-chloro-2 aminoel-methoxybenzene'having its melting point at 52 C. a

In testimony whereof Ialfix my signature. WILHELM FITZKY. 

